LM340-N, LM78xx

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SNOSBT0I – FEBRUARY 2000 – REVISED MARCH 2013

LM340-N/LM78XX Series 3-Terminal Positive Regulators

Check for Samples: LM340-N, LM78xx

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FEATURES

DESCRIPTION

The LM140/LM340A/LM340-N/LM78XXC monolithic

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•

Complete Specifications at 1A Load

3-terminal positive voltage regulators employ internal

•

current-limiting, thermal shutdown and safe-area

and ±4% Over the Temperature Range

compensation, making them essentially indestructible.

(LM340A)

If adequate heat sinking is provided, they can deliver

over 1.0A output current. They are intended as fixed

•

voltage regulators in a wide range of applications

1A Load (LM340A)

including local (on-card) regulation for elimination of

•

noise and distribution problems associated with

•

Internal Thermal Overload Protection

single-point regulation. In addition to use as fixed

voltage regulators, these devices can be used with

•

Internal Short-circuit Current Limit

external components to obtain adjustable output

•

Output Transistor Safe Area Protection

voltages and currents.

•

Considerable effort was expended to make the entire

series of regulators easy to use and minimize the

number of external components. It is not necessary to

bypass the output, although this does improve

transient response. Input bypassing is needed only if

the regulator is located far from the filter capacitor of

the power supply.

The 5V, 12V, and 15V regulator options are available

in

the

steel

TO-3

power

package.

The

LM340A/LM340-N/LM78XXC series is available in the

TO-220 plastic power package, and the LM340-N-5.0

is available in the SOT-223 package, as well as the

LM340-5.0 and LM340-12 in the surface-mount

DDPAK/TO-263 package.

Typical Applications

*Required if the regulator is located far from the power supply filter.

**Although no output capacitor is needed for stability, it does help

transient response. (If needed, use 0.1

μF, ceramic disc).

Figure 1. Fixed Output Regulator

Figure 2. Adjustable Output Regulator

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PRODUCTION DATA information is current as of publication date.

Copyright © 2000–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.